. >> they use mortars first, aiming for taliban dug into the hills. but the incoming fire is very accurate here. >> go. go. go! >> they range cover from heavy machine guns. >> but the bullets are too close. >> that was the scene in an isolated american military outpost in afghanistan's kunar province. troops were assaulted by taliban insurgents hiding in the hills above. our reporter was there and covered the fire. tonight he joins us from another combat outpost in kunar province. so, nick, the obvious question is what is it look? you were there with the servicemen in that outpost. what is it like to come under siege like this day in, day out in afghanistan? >> reporter: well, i think there is a very large barrier. for me, it is sedentary, for the troops themselves, it's a fairly harrowing ordeal to have this constant potential threat of large attack. in the back of their minds, there is always the possibility that it could get overrun. there have been two serious ininstances in which outposts like that surrounded by taliban and they've been attacked